I executed the command:
dconf reset -f /
to reset the dash to dock and other extension changes, then when i rebooted my system.
Everything installed from the beginning, starting from user name everything as if i installed a new Ubuntu OS, then i proceeded with the steps ,and all my old files where gone, but my terminal command installations and other applications were available,I started to use , then suddenly i got prompt showing my storage space is full ,i have 78GB for my Ubuntu ,can someone help to recover my old files, as it occupies storage space it looks like it is still in my drive or at least how to get rid of those files alone(only).
I use Ubuntu 20.04.1 LTS, Gnome version 3.36